prototype for capturing log messages regardless of logging configuration

agent/src/main/java/com/teamscale/jacoco/agent/PreMain.java

@@ -15,6 +15,7 @@
 import com.teamscale.jacoco.agent.util.DebugLogDirectoryPropertyDefiner;
 import com.teamscale.jacoco.agent.util.LogDirectoryPropertyDefiner;
 import com.teamscale.jacoco.agent.util.LoggingUtils;
+import com.teamscale.jacoco.agent.util.TeamscaleLogAppender;
 import org.conqat.lib.commons.collections.CollectionUtils;
 import org.conqat.lib.commons.filesystem.FileSystemUtils;
 import org.conqat.lib.commons.string.StringUtils;
@@ -104,9 +105,11 @@ private static AgentOptions getAndApplyAgentOptions(String options, String envir
 		}
 
 		TeamscaleCredentials credentials = TeamscalePropertiesUtils.parseCredentials();
+		TeamscaleLogAppender.start(credentials);
 		if (credentials == null) {
 			delayedLogger.warn("Did not find a teamscale.properties file!");
 		}
+
 		AgentOptions agentOptions;
 		try {
 			agentOptions = AgentOptionsParser.parse(options, environmentConfigId, environmentConfigFile, credentials, delayedLogger);
@@ -129,6 +132,7 @@ private static AgentOptions getAndApplyAgentOptions(String options, String envir
 		initializeLogging(agentOptions, delayedLogger);
 		Logger logger = LoggingUtils.getLogger(Agent.class);
 		delayedLogger.logTo(logger);
+
 		HttpUtils.setShouldValidateSsl(agentOptions.shouldValidateSsl());
 		return agentOptions;
 	}

agent/src/main/java/com/teamscale/jacoco/agent/util/LoggingUtils.java

@@ -65,6 +65,9 @@ private static void reconfigureLoggerContext(InputStream stream) {
 			configurator.setContext(loggerContext);
 			loggerContext.reset();
 			configurator.doConfigure(stream);
+
+			InputStream remoteLoggingStream = Agent.class.getResourceAsStream("logback-remote-logging.xml");
+			configurator.doConfigure(remoteLoggingStream);
 		} catch (JoranException je) {
 			// StatusPrinter will handle this
 		}

agent/src/main/java/com/teamscale/jacoco/agent/util/TeamscaleLogAppender.java

@@ -0,0 +1,30 @@
+package com.teamscale.jacoco.agent.util;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.AppenderBase;
+import com.teamscale.jacoco.agent.options.TeamscaleCredentials;
+
+public class TeamscaleLogAppender extends AppenderBase<ILoggingEvent> {
+
+	public static void start(TeamscaleCredentials credentials) {
+		TeamscaleLogAppender.credentials = credentials;
+		if (credentials == null) {
+			enabled = false;
+			// TODO (FS) cancel any background threads and clear any buffered messages
+		}
+	}
+
+	private static TeamscaleCredentials credentials = null;
+	private static boolean enabled = true;
+
+	@Override
+	protected void append(ILoggingEvent eventObject) {
+		if (!enabled) {
+			return;
+		}
+		// TODO (FS) buffer and send events to Teamscale asynchronously
+		// TODO (FS) log messages may arrive before credentials are set. buffer in this case until either disabled() or credentials are available
+		System.err.println(
+				"----> event: " + eventObject.getTimeStamp() + " " + eventObject.getLevel() + " " + eventObject.getLoggerName() + " " + eventObject.getFormattedMessage());
+	}
+}

agent/src/main/resources/com/teamscale/jacoco/agent/logback-remote-logging.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- This configuration can be run after any other configuration to add the TeamscaleLogAppender. -->
+<configuration>
+    <appender name="Teamscale" class="com.teamscale.jacoco.agent.util.TeamscaleLogAppender">
+    </appender>
+
+    <root>
+        <appender-ref ref="Teamscale"/>
+    </root>
+</configuration>